CVE-2026-117939
Received Received - Intake

Use-after-free in Firefox

Publication date: 2026-10-27

Last updated on: 2026-10-27

Assigner: Mozilla Corporation

Description
Use-after-free in the XML component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, and Firefox ESR 153.6.

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Meta Information

Published
2026-10-27
Last Modified
2026-10-27
Generated
2026-10-27
AI Q&A
2026-10-27
EPSS Evaluated
N/A
NVD
CVE-2026-117939
EUVD
EUVD-2026-110970

Affected Vendors & Products

Currently, no data is known.

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This is a use-after-free vulnerability in the XML component of Firefox. Use-after-free occurs when a program continues to use memory after it has been freed, potentially leading to crashes or arbitrary code execution.

Impact Analysis

An attacker could exploit this to crash the browser or run malicious code on your system. This may allow unauthorized access to sensitive data or system control if combined with other vulnerabilities.

Mitigation Strategies

Update Firefox to version 159 or later, Firefox ESR 115.44 or later, or Firefox ESR 153.6 or later to address the use-after-free vulnerability in the XML component.

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